Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9576b20a4b46ad6…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 03:10:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 757ff8b60bca807ab3a7629be1bce137 SHA-1: 9b2a313de3890b7691c2e8b32ce3e2860fce1261 SHA-256: d9576b20a4b46ad60fa0044ef6c7a1c0dc7a66768db6fc37cc958d320b819a25
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free generator / game hack' lures. The embedded URL http://netcdn.tw/app/431946152/earnrobux-game-hack is the primary indicator of this malicious redirection. The presence of a visual download button further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/431946152/earnrobux-game-hack In PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-working_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-hacks-lua-commands_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-app_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-gift-cards-hack_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/robux-xyz_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-cheat-in-roblox-pet-simulator_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-black-wings-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-gas-station-simulator-cheat_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/will-roblox-be-free-on-ps4_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-hack-coin-master-computer_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-links-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/minecraft-free-apk-download-016-0_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D0 22576 bytes
SHA-256: f20c71bf5c5688fb3bb3b7526c031653389a7ec3ba1de0fab0f02872fb970e6b
font_01_sfnt_off00006319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6319 18552 bytes
SHA-256: 6794fc7ee49cdd0a33f98bbbc8a763353555002210e507bd98e2a39f67d6f290